Cheng Chieh

Cheng Chieh (3 April 1993-10 May 2016) was a Taiwanese student who killed 4 people and injured 24 in a stabbing attack on the Taipei Metro on 21 May 2014, the first fatal attack on the subway system. Sentenced to 144 years in prison and four death sentences, he was executed by firing squad on 10 May 2016.

Biography
Cheng Chieh was born on 3 April 1993, and he attended schools in Taipei, Taiwan. He focused on his studies and had few friends growing up, and he wrote horror stories and played violent video games. In elementary school, he threatened to kill classmates over disagreements, and in middle school he planned to kill his teacher with a knife. In 2011, he enrolled in the Chung Cheng Institute of Technology with the goal of receiving military training, but he was expelled in 2013, and he moved to the Banqiao District of Taipei with his parents and older brother. On 21 May 2014, he headed to Jiangzicui Station in New Taipei City and killed four people while injuring 24 in a stabbing attack, and he revealed that he decided to carry out the attack because he had no classes and becuase he wanted to do something "shocking and big". Chieh was sentenced to 144 years in prison and four death sentences, and at 8:47 PM on 10 May 2016 he was executed with three gunshots without his appeal being heard.